The four-star cornerback will be staying in Los Angeles, committing to UCLA on Wednesday.
"The school I'm going to be going with is UCLA," said Jefferson.
"Family is a big thing, I'm really focused on my family," said Jefferson.
He joins Cathedral teammate Randall Carroll, a freshman receiver, with the Bruins.
Jefferson said he was glad to draw the process to a close.
"It was pretty hectic and it really got difficult," said Jefferson. "Ultimately it came down to where I'm most comfortable with."